import sys

inputs = sys.stdin.readline

"""再帰関数のときセット
sys.setrecursionlimit(10**7)
import pypyjit
pypyjit.set_param('max_unroll_recursion=-1')
"""


def main():
    S = input()
    if S[0] == "x":
        print(2 ** 32 - int(S[1:]))
    else:
        print(S)


if __name__ == '__main__':
    main()